Granted. "No action will lie from words published on any one of these occasions even if the plaintiff prove that the defendant published them with full knowledge of the falsity and with an intention of injuring the plaintiff." There could not be anything better than that. Odgers puts it this way:
Absolutely privileged occasions:
All actions in respect of words spoken thereon are absolutely forbidden even though it be alleged that the words were spoken falsely, knowingly and with express malice.
Frazer, on libel and slander, says:
Privileged occasions are of two kinds.
On the first occasion of absolute privilege he says:
No action lies however untrue and malicious the statements may have been.
Finally, the Simonds Edition of Halsbury, in Volume 24, says:
If the occasion of the publication is one of absolute privilege the statement also is absolutely privileged and no action for defamation, either for libel or slander, lies, whether the defendant was actuated by malice or not.